Prime Rib Recipe (Reverse Sear, Foolproof Medium-Rare)

Prime rib is the most expensive cut most home cooks ever put in an oven — a bone-in standing rib roast runs $15 to $25 a pound, which means a holiday centerpiece for eight people can easily cross $200 before you’ve even opened the wine. And yet the recipe is almost embarrassingly simple. Salt, heat, and a thermometer. Get those three right and the roast is foolproof; get any of them wrong and you’re serving grey slices to twelve people who drove in for it. This is the same rules-of-the-road approach that makes classics like beef bourguignon reliable — pick your beef well, then get out of its way.

How much prime rib to buy per person

The math is straightforward and worth doing at the butcher counter, not at 5 p.m. on the day of. Underbuy and you’re carving thin slivers; overbuy and you paid $40 for leftovers that will sit in the fridge until Wednesday.

Bone-in: plan on 1 pound per person. The bones account for roughly 15% of the total weight, so a 6-pound roast feeds six comfortably with a slice per person and a small leftover heel.

Boneless: plan on 0.75 pounds per person. There’s no bone weight to discount, and boneless slices carve a little cleaner.

Prime rib is sold by the rib. A whole standing rib roast is 7 bones and weighs 14 to 18 pounds — enough for a party of 14. Most home cooks buy a 3- to 4-rib roast (6–8 lbs) for holiday dinners of 6 to 8 people. If you can, ask the butcher for the first cut (ribs 10 through 12, closer to the loin) — it’s leaner, has a larger eye of ribeye muscle, and is the more tender end of the roast.

Bone-in or boneless?

Both work. The best pit-master answer is a diplomatic “it depends,” but for a holiday roast served with au jus, bone-in wins clearly on two fronts and boneless wins clearly on one. Here’s the honest side-by-side.

The 48-hour dry brine (do not skip)

If you take one thing from this article, take this: salt the roast 24 to 48 hours before it goes in the oven, and leave it uncovered in the fridge. This single step is the difference between a “good” prime rib and a “how did you do that” prime rib.

Use ½ teaspoon of kosher salt per pound. Rub it into every surface, including the ends. Set the roast on a wire rack over a sheet pan and slide it into the coldest part of the fridge, uncovered. Don’t wrap it, don’t cover it — the whole point is to let the surface dry out.

Timing matters. Twenty-four hours is the minimum for salt to fully penetrate a 6-pound roast; 48 hours is better and gives you a more evenly seasoned interior. Any longer than 72 hours and the meat starts to taste like ham. Two nights ahead is the sweet spot.

The morning of, pull the roast out and let it sit on the counter for a full hour before cooking. A cold-from-the-fridge roast will cook unevenly — the edges hit medium while the center is still cold rare. This is the same principle we lean on for cast-iron steak: salt early, temper before heat.

Ingredients & simple herb crust

The seasoning list is short on purpose. Prime rib is one of the most flavorful cuts of beef there is — piling on marinades or spice blends fights the meat instead of framing it. Salt, garlic, two woodsy herbs, black pepper, and fat. That’s the whole crust.

Three ways to cook prime rib, compared

There are three respectable methods, each with a different trade-off between crust, evenness, and how much attention the oven wants from you. All three land the same target internal temperature; they just get there different ways.

The reverse-sear method, step by step

This is the walk-through for the reverse sear. It looks long because I’m explaining every step — the actual hands-on time is under 20 minutes. The oven does everything else.

1. Dry-brine 48 hours ahead.Pat the roast dry, rub kosher salt (½ tsp per pound) into every surface, set it bone-side-down on a wire rack over a sheet pan, and refrigerate uncovered for 24 to 48 hours. This is 90% of the work.
2. Temper 1 hour before cooking.Pull the roast out and let it sit on the counter for a full hour. Meanwhile, whisk the garlic, rosemary, thyme, black pepper, Dijon, and olive oil into a loose paste.
3. Rub and preheat.Set the oven to 225°F / 107°C (a low-and-slow start is non-negotiable). Massage the herb paste into every surface of the roast, including the ends. Place bone-side down on the wire rack, insert a probe thermometer into the center of the eye, away from the bone.
4. Slow-roast to 120°F.Roast at 225°F until the probe reads 120°F / 49°C, roughly 30 minutes per pound. For a 6-lb roast, that’s about 3 hours. Trust the thermometer, not the clock — your oven runs hotter or cooler than mine.
5. Rest for 30 minutes.Pull the roast out and tent loosely with foil (loose, not sealed — sealed foil steams the crust off). While it rests, crank the oven to 500°F / 260°C. This is your only chance to make au jus from the drippings; do it now.
6. High-heat sear for the crust.Return the roast to the 500°F oven for 8 to 10 minutes, until the exterior is dark mahogany and audibly crackling. Do not walk away — the difference between “gorgeous crust” and “burnt herbs” is 90 seconds at this temperature.
7. Rest a second time, then carve.Pull it out and rest 10 more minutes before carving. The final internal temperature will settle around 128–130°F — perfect medium-rare. Carve against the grain in ½-inch planks.

Cook time & internal temp by doneness

Non-negotiable rule of prime rib: pull the roast 5°F below your target, because carryover cooking during the rest will raise the internal temperature another 5 to 10 degrees. If you pull at your target, you’ll overshoot into the next doneness. Here’s the cheat sheet using the reverse-sear method at 225°F.

Au jus & horseradish cream in 5 minutes each

Prime rib without au jus is like turkey without gravy — technically legal, but why? Both sauces come together while the roast rests, using the drippings you just spent three hours making.

Au jus. Pour off all but 2 tablespoons of the drippings from the sheet pan. Set it over medium heat on the stove (yes, the whole sheet pan — or scrape the drippings into a small saucepan). Add the minced shallot and sweat for 60 seconds. Deglaze with ½ cup of red wine, scraping the fond, and let it reduce for 2 minutes. Pour in 2 cups of low-sodium beef stock, bring to a simmer, and reduce by a third — about 6 minutes. Season and strain. If you want a richer sauce, cheat with a spoonful of homemade beef gravy stirred in.

Horseradish cream. Whisk 1 cup sour cream with 3 tablespoons prepared horseradish (squeeze it dry in a paper towel first — bottled horseradish is watery), 1 tablespoon Dijon mustard, 1 teaspoon lemon juice, and a big pinch each of salt and pepper. Taste. Add another spoon of horseradish if you want more bite. Refrigerate for at least 30 minutes so the flavors marry.

What to serve with prime rib

This is a rich, showpiece dish. The sides should be substantial enough to hold their own, but simple enough that they don’t compete with the roast for attention. Classic steakhouse pairings work best.

• Yorkshire pudding — the classic British pairing. Uses the beef drippings while the roast rests. Puffed, golden, hollow inside.
• Creamy mashed potatoes — full-fat, plenty of butter, a splash of warm cream. Skin-on for texture, skin-off for elegance.
• Roasted asparagus or Brussels sprouts — 425°F, olive oil, salt. The bright green cuts through the richness of the meat.
• Creamed spinach — the steakhouse classic. Béchamel base, sautéed spinach folded in, a hit of nutmeg.
• Popovers or crusty bread — for sopping up au jus. Non-negotiable.
• A sharp salad — arugula with lemon vinaigrette and shaved parmesan. Acid resets the palate between rich bites.

How to carve a standing rib roast

Carving looks intimidating but takes 90 seconds once you know the geometry. You’re doing two things: separating the meat from the bones, then slicing the meat against the grain.

Step 1: Free the meat from the bones. Stand the roast on its side so the bones are horizontal. Run a long, sharp knife along the curve of the bones from top to bottom — one long, smooth stroke, following the rib bones. The whole meat cap should lift off in one piece.

Step 2: Slice against the grain. Lay the meat flat on the cutting board with the crust side up. Look for the direction the muscle fibers run — usually along the length of the roast. Slice perpendicular to those fibers in ½-inch planks. Serve two planks per person for a generous portion.

Step 3: Save the bones. Wrap them in foil and refrigerate. They make an incredible beef broth the next day, or you can gnaw on them cold at midnight like a raccoon in a tuxedo. Both are legitimate uses.

Storing & reheating leftovers without ruining them

The biggest sin with leftover prime rib is nuking a cold slice in the microwave — you’ll take a $25 slice and turn it into shoe leather. Here’s how to keep it beautiful.

For a fuller playbook on high-end leftover cuts (many of the same techniques apply), see what to do with leftover filet mignon.

3 mistakes that ruin a prime rib

After three hours of low-and-slow patience, most prime rib failures happen in the last 15 minutes — usually because someone got impatient or trusted the wrong signal. Here are the three that keep butchers awake at night.

Frequently asked questions